Converting a 5.56 AR-15 to 9mm involves changing the barrel, bolt, and buffer due to the shift from gas operation to straight blowback. 9mm barrels lack gas ports and locking lugs, while the bolt and buffer must be heavier to manage the blowback force. Adapters are necessary to use pistol magazines, with options like Stern Defense for Glock mags and Hahn Precision for Colt-style mags.
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